MATLAB Answers

py.os.popen error under Windows

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Xiangrui Li
Xiangrui Li on 17 Jun 2017
Commented: maho on 16 Jul 2019
Later matlab versions can call python libraries directly. I came across a problem when calling py.os.popen or py.subprocess.check_output. From the error message below, os.popen() seems calling subprocess:
h = py.os.popen('dir');
Error using subprocess>_make_inheritable (line 948)
Python Error: OSError: [WinError 6] The handle is invalid
Error in subprocess>_get_handles (line 898)
p2cread = self._make_inheritable(p2cread)
Error in subprocess>__init__ (line 665)
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
Error in os>popen (line 978)
bufsize=buffering)
More info about the system: Matlab 2017a under Windows 7, python 3.6.
There is no error under Linux with python 2.7.6, matlab R2015a.

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Answers (1)

Nagarjuna Manchineni
Nagarjuna Manchineni on 20 Jun 2017
To call Python libraries from MATLAB, you need to install a supported version of the reference implementation (CPython) for Python. MATLAB R2017a supports versions 2.7, 3.4, and 3.5.
I tried the same command on MATLAB R2017a with Python version 3.5 and everything worked fine. I would recommend to use the supported version of Python (3.5).
See the following documentation page for more reference:

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Xiangrui Li
Xiangrui Li on 20 Jun 2017
Thanks for answering. But that does not seem to be the cause. Could something else be wrong on my Windows 7 system?
disp(pyversion)
3.5
h = py.os.popen('dir');
Error using subprocess>_make_inheritable (line 913)
Python Error: OSError: [WinError 6] The handle is invalid
Error in subprocess>_get_handles (line 863)
p2cread = self._make_inheritable(p2cread)
Error in subprocess>__init__ (line 640)
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
Error in os>popen (line 1035)
bufsize=buffering)
maho
maho on 16 Jul 2019
Having the same problem on python 3.7

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